State of Technology Report for Force Main Rehabilitation, Final ...
State of Technology Report for Force Main Rehabilitation, Final ...
State of Technology Report for Force Main Rehabilitation, Final ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Technology</strong>/Method Sliplining/HDD/Pipe Bursting/Direct Bury<br />
Temperature Range,<br />
o F<br />
Limited to 140 o F and below. Above 73 o F standard internal pressure de-rating<br />
factors apply <strong>for</strong> long-term elevated temperature exposure<br />
Renewal Length, feet Standard guidance <strong>of</strong> 300-500 feet <strong>for</strong> pipe bursting with length <strong>of</strong> >1,000 feet<br />
completed in a single burst. Slipline length <strong>of</strong> 3,500 feet in a single pull have<br />
been completed. HDD lengths <strong>of</strong> over 5,100 feet in a single length.<br />
Other Notes Not available.<br />
III. <strong>Technology</strong> Design, Installation, and QA/QC In<strong>for</strong>mation<br />
Product Standards AWWA C900, AWWA C905, NSF 61 Certified (<strong>for</strong> potable water applications),<br />
ASTM D2241, D3034, F679, D1785<br />
Design Standards AWWA C900, AWWA C905<br />
Design Life Range 100+ years<br />
Installation Standards ASCE “Pipe Bursting Projects” - ASCE Manual and <strong>Report</strong> on Engineering<br />
Installation<br />
Methodology<br />
Practice #112. AWWA installation standard is in development.<br />
For sliplining, host pipe is cleaned and CCTV inspected. Depending on site<br />
logistics, the Fusible PVC pipes can be strung out and the joints butt fused<br />
above grade prior to insertion, or butt fused in the ditch. For pipe bursting, the<br />
pipe normally is butt fused in a single length. Static burst methods only are used.<br />
The fused PVC pipe is either winched into the host pipe <strong>for</strong> sliplining, or pulled in<br />
behind the expansion head <strong>for</strong> pipe bursting. A non-rigid connection from the<br />
pipe to the expansion head is used. In all installation methods the maximum<br />
recommended pull <strong>for</strong>ce and the minimum recommended bend radius must be<br />
followed.<br />
QA/QC The stock pipe is subjected to all <strong>of</strong> the normal QC requirements in AWWA<br />
C900/C905, including dimensional con<strong>for</strong>mance, flattening, acetone immersion,<br />
hydrostatic, and burst tests. UGSI includes impact, heat reversion, and axial<br />
tensile testing as well. In addition 3 rd party labs are used to confirm extrusion<br />
results on key tests prior to shipment. The fusion process parameters <strong>of</strong> pressure<br />
and the time are recorded <strong>for</strong> each joint using a datalogger. Additional parameters<br />
such as the heat plate temperature are also recorded.<br />
IV. Operation and <strong>Main</strong>tenance Requirements<br />
O&M Needs No special O&M needs.<br />
Repair Requirements<br />
<strong>for</strong> Rehabilitated<br />
Sections<br />
Cut out and replace with AWWA PVC <strong>of</strong> the same OD, using repair clamps and<br />
all standard PVC and DI water works fittings.<br />
V. Costs<br />
Key Cost Factors Benefits: Due to the high tensile strength <strong>of</strong> PVC (compared to s<strong>of</strong>ter<br />
thermoplastic rehab materials), Fusible PVC allows longer lengths <strong>of</strong> cased and<br />
uncased pulls, which can reduce the number and cost <strong>of</strong> pit excavations required.<br />
Reduced wall thickness <strong>for</strong> a given pressure maximizes inner diameter (ID) <strong>for</strong> a<br />
given outer diameter (OD) either maximizing flow in an OD constrained<br />
environment or minimizing cost <strong>of</strong> pipe material and installation as well as risk<br />
<strong>for</strong> a given ID and pressure requirement. Additional ease and reduced cost <strong>of</strong><br />
reconnections using standard water works fittings.<br />
Limitations: Due to limitations <strong>of</strong> bending radius, Fusible PVC may require<br />
longer insertion pits over s<strong>of</strong>ter thermoplastics.<br />
Case Study Costs Fusible PVC pipe was used <strong>for</strong> a 5,120 feet directional drill crossing under the<br />
Beau<strong>for</strong>t River <strong>for</strong> the Beau<strong>for</strong>t Jasper Water & Sewer Authority in June <strong>of</strong> 2007<br />
and was compared in costs to both steel and HDPE pipe. The overall project cost<br />
$1.7 million and the customer estimated savings <strong>of</strong> $400,000 (materials and<br />
installation) by selecting Fusible PVC pipe over other materials <strong>for</strong> the drill<br />
portion.<br />
VI. Data Sources<br />
References www.undergroundsolutions.com<br />
A-69